Flash Flood in Dallas County, Iowa

Flash Flood in Dallas County, Iowa: 53 recorded events between 1998 and 2022. The strongest on record measured 0. That places the county #561 nationally and #8 statewide for this hazard.

Reporting practice changed over time — early decades are undercounted, not calmer.

The busiest decade for flash flood in Dallas County is the 2010s, when 26 of the county's 53 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.

Within the Dallas County archive, flash flood makes up 5.5% of all recorded severe weather across 8 hazard types. Nationally the county sits at #561 for this hazard and #8 within Iowa, putting it in the 81.5 percentile of all U.S. counties.

Jun is the peak month for flash flood in Dallas County with 27 recorded events, while Jan is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.

• Thunderstorm Wind 350
• Hail 249
• Heavy Rain 140
• Flood 83
• Tornado 58

How many flash flood events are on record in Dallas County, Iowa?

53 flash flood events are recorded in Dallas County between 1998 and 2022, causing 0 direct deaths.

What is the strongest flash flood recorded in Dallas County?

The strongest flash flood on record in Dallas County measured 0.

Where does the flash flood data for Dallas County come from?

All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.